yah, the pro win is a bit over sized and there is a detent system that runs down the right side of the mechbox so you can release the spring pressure so it can be removed and a larger or smaller spring put in. It doesn't weaken the body at all and you must file down the right side to be flush with the rest of the body.
It took me and my roommate a bit over an hour each to do our own guns and we used the old dremil.
Ive been running mine for 2 years now and never had a complaint with the mech box or the body.
If you dont want to burn 1500 on a PTW then this is your way to go.
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why cant westcan come back?
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